AS and A Level Biology Lesson Element - Biochemistry

Multiple Choice Questions (MCQ) topic quiz BiochemistryInstructions and answers for teachers

These instructions cover the learner activity section which can be found on page 9.

This Lesson Element supports OCR AS and A Level Biology A (H020/H420) and Biology B (Advancing Biology) (H022/H422).

When distributing the activity section to the learners either as a printed copy or as a Word file you will need to remove the teacher instructions section.

The Activity

This Lesson Element contains 20 multiple choice questions on the theme of biochemistry. Some questions might require synoptic thinking, using knowledge and ideas from various topics across the full A Level content.

This resource can be used to test and consolidate understanding at the end of a topic or to revisit and refresh knowledge at a later point in the course.

Introduction

Multiple choice questions allow rapid coverage of a wide range of sub-topics.

Contrary to a widespread belief among students, multiple choice questions are not necessarily easy – they can be easy, moderate or difficult.

The questions are written so that the incorrect answers are plausible distractors based on common errors or misconceptions.

The questions in this quiz cover topics mainly from specification sections:

Biology A 2.1.2 Biological molecules

Biology B (Advancing Biology) 2.1.2 Water and its importance in plants and animals2.1.3 Proteins and enzymes.

Multiple Choice Questions (MCQ) topic quiz - answers

1A 0.5 mol dm3 solution of sucrose was heated at 80 °C for 5 min with Benedict’s reagent. What was the resulting colour?

A

blue

B

blue-black

C

purple

D

brick-red

Your answer

2A carbon compound extracted from living tissue was found to contain exactly twice as many hydrogen atoms as oxygen atoms.

To which of the following classes of biological molecule is it likely to belong?

A

carbohydrate

B

lipid

C

nucleic acid

D

protein

Your answer

For the processes shown in questions 3-6, identify the reaction type A – D.

A

reduction

B

oxidation

C

hydrolysis

D

condensation

3maltose → glucose

Your answer

4amino acids → polypeptide

Your answer

5cytochrome C Fe 2+ → cytochrome C Fe 3+

Your answer

6 NADH → NAD+

Your answer

Below are four types of bond. For questions 7-10, identify the bonds found in the biological molecule.

A

glycosidic

B

peptide

C

ester

D

phosphodiester

7Haemoglobin

Your answer

8Triglyceride

Your answer

9Collagen

Your answer

10RNA

Your answer

11Which of these compounds would contain the smallest number of oxygen atoms?

A

a saturated fatty acid

B

a polypeptide

C

a polysaccharide

D

glycerol

Your answer

12What is the general formula for a disaccharide?

A

C12H25O12

B

C12H24O11

C

C12H22O12

D

C12H22O11

Your answer

13Which one of these carbohydrates contains 1-6 glycosidic bonds?

A

amylose

B

amylopectin

C

maltose

D

cellulose

Your answer

14On complete hydrolysis, which of the following would produce the fewest molecules?

A

phospholipid

B

triglyceride

C

sucrose

D

polypeptide

Your answer

15Which monosaccharide is shown in the diagram below?

A

ribose

B

deoxyribose

C

α glucose

D

β glucose

Your answer

16Amino acids vary according to their R group. Which one of the following R groups would be hydrophobic?

A

CH3

B

CH2 OH

C

CH2 COOH

D

H

Your answer

17Substances which can act as both acid and base are used in experiments to maintain a constant pH. What are the substances known as?

A

polar molecules

B

buffers

C

cofactors

D

reducing agents

Your answer

18Which of the following molecules does not yield only α glucose molecules on complete hydrolysis?

A

amylose

B

glycogen

C

maltose

D

sucrose

Your answer

19Which of these techniques could be used to separate molecules according to their differential solubility in a given solvent?

A

electrophoresis

B

chromatography

C

ultracentrifugation

D

filtration

Your answer

20How many different tripeptides can be made using the 20 commonly occurring amino acids?

A

40

B

400

C

4000

D

8000

Your answer

Multiple Choice Questions (MCQ) topic quizBiochemistryLearner Activity

1A 0.5 mol dm3 solution of sucrose was heated at 80 °C for 5 min with Benedict’s reagent. What was the resulting colour?

A

blue

B

blue-black

C

purple

D

brick-red

Your answer

2A carbon compound extracted from living tissue was found tocontain exactly twice as many hydrogen atoms as oxygen atoms.

To which of the following classes of biological molecule is it likely to belong?

A

carbohydrate

B

lipid

C

nucleic acid

D

protein

Your answer

For the processes shown in questions 3-6, identify the reaction type A – D.

A

reduction

B

oxidation

C

hydrolysis

D

condensation

3maltose → glucose

Your answer

4

amino acids → polypeptide

Your answer

5

cytochrome C Fe 2+ → cytochrome C Fe 3+

Your answer

6

NADH → NAD+

Your answer

Below are four types of bond. For questions 7-10, identify the bonds found in the biological molecule.

A

glycosidic

B

peptide

C

ester

D

phosphodiester

7Haemoglobin

Your answer

8Triglyceride

Your answer

9Collagen

Your answer

10RNA

Your answer

11Which of these compounds would contain the smallest number of oxygen atoms?

A

a saturated fatty acid

B

a polypeptide

C

a polysaccharide

D

glycerol

Your answer

12What is the general formula for a disaccharide?

A

C12H25O12

B

C12H24O11

C

C12H22O12

D

C12H22O11

Your answer

13Which one of these carbohydrates contains 1-6 glycosidic bonds?

A

amylose

B

amylopectin

C

maltose

D

cellulose

Your answer

14On complete hydrolysis, which of the following would produce the fewest molecules?

A

phospholipid

B

triglyceride

C

sucrose

D

polypeptide

Your answer

15Which monosaccharide is shown in the diagram below?

A

ribose

B

deoxyribose

C

α glucose

D

β glucose

Your answer

16Amino acids vary according to their R group. Which one of the following R groups would be hydrophobic?

A

CH3

B

CH2 OH

C

CH2 COOH

D

H

Your answer

17Substances which can act as both acid and base are used in experiments to maintain a constant pH. What are the substances known as?

A

polar molecules

B

buffers

C

cofactors

D

reducing agents

Your answer

18Which of the following molecules does not yield only α glucose molecules on complete hydrolysis?

A

amylose

B

glycogen

C

maltose

D

sucrose

Your answer

19Which of these techniques could be used to separate molecules according to their differential solubility in a given solvent?

A

electrophoresis

B

chromatography

C

ultracentrifugation

D

filtration

Your answer

20How many different tripeptides can be made using the 20 commonly occurring amino acids?

A

40

B

400

C

4000

D

8000

Your answer

A

A

C

D

B

B

B

C

B

D

A

D

B

C

D

A

B

D

B

D

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